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Glazing simply indicates the windows in your house, including both openable and set windows, in addition to doors with glass and skylights. Glazing actually just indicates the glass part, but it is usually used to refer to all aspects of an assembly consisting of glass, films, frames and home furnishings. Taking notice of all of these elements will help you to accomplish effective passive design.

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Energy-efficient glazing makes your home more comfy and significantly lowers your energy expenses. Nevertheless, inappropriate or improperly designed glazing can be a major source of undesirable heat gain in summer and substantial heat loss and condensation in winter. Up to 87% of a house's heating energy can be gained and up to 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your house. A preliminary financial investment in energy-efficient windows, skylights and doors can greatly lower your annual heating and cooling costs.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding some of the key homes of glass will help you to select the finest glazing for your home. Secret residential or commercial properties of glass Source: Adjusted from the Australian Window Association The amount of light that travels through the glazing is called visible light transmittance (VLT) or noticeable transmittance (VT).

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The U worth for windows (revealed as Uw), describes the conduction of the whole window (glass and frame together). The lower the U worth, the greater a window's resistance to heat flow and the much better its insulating value.

If your house has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter's night when it is 15C colder outside compared with inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall heat output of a big room gas heating unit or a 6.

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If you choose a window with half the U worth (3. 1W/m2 C) (for instance, double glazing with an argon-filled gap and less-conductive frames), you can cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (revealed as SHGCw) determines how readily heat from direct sunlight flows through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the house interior. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass.

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When the sun is perpendicular (at 90) to the glass, it has an angle of incidence of 0 and the window will experience the optimum possible solar heat gain. The SHGC stated by glazing producers is constantly determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transmitted.